New college students usually need sheets, comforters, towels, and the like. We bought my nephew a laundry basket filled with towels, sheets, plastic cups and plates, an iron, shower caddy, cleaning supplies, desk lamp, fan, and some other personal care odds and ends. If taking things on the plane is an issue you could include an "IOU" for shipping and cover the shipping costs when she leaves.
If she is going far away (depending on your budget) you could also consider a travel certificate from an airline or a site like orbitz or Expedia. Travel can get expensive and limit the trips home for a homesick freshman.
The other thing someone got a friends son was a digital frame with a memory stick of friends and family photos and a phone book with everyone's phone number, address and email.